京津城际轨道交通北京试验段组合桩复合地基沉降特性研究
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摘要
京津城际是我国首条开通速度达300km/h的客运专线,线路采用无砟轨道博格板技术,工后沉降应控制在15mm以内,路基主要采用CFG桩复合地基处理形式,但在一些地段采取了CFG+碎石桩复合地基处理形式。基于国内外尚无高速铁路的组合桩复合地基的工程实例,本文依托“客运专线路基沉降控制措施及变形观测技术研究”课题进行北京段CFG桩+碎石桩复合地基沉降特性研究。课题通过对比不同位置桩土应力比及桩土沉降差异,评价了CFG桩及组合桩复合地基在北京段应用效果,并比较两种类型控制沉降的作用效果;通过大量沉降实测数据估算出后期的工后沉降;最后通过Midas-GTS有限元软件,比较分析了组合桩与CFG桩两种复合地基处理效果。通过以上研究,得到了以下初步结论:
1、桩承担着大部分荷载,在堆载过程中,桩的部分荷载转移到土体;在该地区填筑路基,其产生的超孔隙水压力很小;在监测段时间内,堆载时间段的沉降量最大,而卸载后,沉降量就很小。
2、通过对实测数据进行双曲线法、新野法的预测分析,北京段路基的沉降量均能控制在规范要求15mm之内,说明了当前设计的合理性。
3、通过实测数据、数值计算均表明,CFG+碎石桩组合桩的沉降小于唯一的CFG桩地基处理,但作用效果不十分明显。
Beijing-Tianjin inter-city rail traffic was the first passenger line opened in China in which the technology of ballastless track and CFG-pile composite foundation were applied. The post-construction settlement should be controled within 25mm. Basing on the gap of CFG-pile composite foundation applied in high railway,settlement characters of composite foundation was studied between Beijing test section, which relied on the subject—study on subgrade settlement control measures and deformation observation technology in passenger line.Then, the effect of CFG-pile composite foundation appiled in Beijing section was evaluated,by comparing pile-soil stress and settlement differences in different location;at the same time,the factors which affect settlement characters and pile-soil stress were researched and a reasonable design parameters were made.The factors they are the length、pile pitch、modulus and thickness of cushion.Based on the above study,some conslusions are below:
1、Most of the load was beared by pile,but during the process of preloading.Some load was transferred from pile to soil; ultra-pore water pressure caused was little in the region;the settlement was the largest during the preloading and it was little after the load removed.
2、The settlement characters of CFG-pile composite foundation caused by subgrade load were inverted bell-shaped;the surface settlement was the largest at the roadbed centerline;with the distance from the roadbed center increaseing,settlement reduced gradually;there was little ground uplift close to the border region.
3、To a certain length,the relationship berween settlement and pile-length is inverse ratio; the longer length, the greater pile-soil stress ratio and the role of pile;the larger distence between pile.the large settlement and pile-soilstress;With cushion modulus increased,the settlement reduced slightly;but the pile-soil stress ratio increase,the impact of cushion thickness on the settlement is not significant,but the pile -soil stress ratio is noticeably affected by the cushion thickness.
1、桩承担着大部分荷载,在堆载过程中,桩的部分荷载转移到土体;在该地区填筑路基,其产生的超孔隙水压力很小;在监测段时间内,堆载时间段的沉降量最大,而卸载后,沉降量就很小。
2、通过对实测数据进行双曲线法、新野法的预测分析,北京段路基的沉降量均能控制在规范要求15mm之内,说明了当前设计的合理性。
3、通过实测数据、数值计算均表明,CFG+碎石桩组合桩的沉降小于唯一的CFG桩地基处理,但作用效果不十分明显。
Beijing-Tianjin inter-city rail traffic was the first passenger line opened in China in which the technology of ballastless track and CFG-pile composite foundation were applied. The post-construction settlement should be controled within 25mm. Basing on the gap of CFG-pile composite foundation applied in high railway,settlement characters of composite foundation was studied between Beijing test section, which relied on the subject—study on subgrade settlement control measures and deformation observation technology in passenger line.Then, the effect of CFG-pile composite foundation appiled in Beijing section was evaluated,by comparing pile-soil stress and settlement differences in different location;at the same time,the factors which affect settlement characters and pile-soil stress were researched and a reasonable design parameters were made.The factors they are the length、pile pitch、modulus and thickness of cushion.Based on the above study,some conslusions are below:
1、Most of the load was beared by pile,but during the process of preloading.Some load was transferred from pile to soil; ultra-pore water pressure caused was little in the region;the settlement was the largest during the preloading and it was little after the load removed.
2、The settlement characters of CFG-pile composite foundation caused by subgrade load were inverted bell-shaped;the surface settlement was the largest at the roadbed centerline;with the distance from the roadbed center increaseing,settlement reduced gradually;there was little ground uplift close to the border region.
3、To a certain length,the relationship berween settlement and pile-length is inverse ratio; the longer length, the greater pile-soil stress ratio and the role of pile;the larger distence between pile.the large settlement and pile-soilstress;With cushion modulus increased,the settlement reduced slightly;but the pile-soil stress ratio increase,the impact of cushion thickness on the settlement is not significant,but the pile -soil stress ratio is noticeably affected by the cushion thickness.
引文
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[44]何思明,郭强,卢国胜.单桩沉降计算理论研究.岩石力学与工程学报.2004,23(4)
[45]梁清香.张根全编著.有限元与MARc实现.北京.机械工业出版社.2003.
[2]张尚东,娄国充,刘俊彦.CFG桩复合地基特性分析及承载力计算.石家庄铁道学院学报.2000.9
[3]牛志荣,李宏.复合地基处理及其工程实践.北京冲国建材工业出版社.2000
[4]娄国充,朴建清,王树栋.CFG桩复合地基工程特性分析.中南公路工程.2001,26(1)
[5]张振营.CFG桩复合地基在工程中的应用.青岛建筑工程学院学报.1997,18(2)
[6]陈清平.CFG桩复合地基的设计、施工及检测.有色金属设计与研究.2000,21(3)
[7]阎明礼.地基处理技术.北京:中国环境科学出版社,1996
[8]阎明礼,吴春林等.水泥粉煤灰碎石桩复合地基试验研究.岩土工程学报,1996,18(2)
[9]阎明礼,刘国安,杨军等.水平荷载作用下CFG桩复合地基的性状.建筑科学,1994
[10]董必昌.CFG桩复合地基沉降计算方法研究.岩石力学与工程学报,2002(21):7
[11]董必昌.CFG桩复合地基沉降计算与数字仿真.工业建筑,2005,S1
[12]娄国充,冯涛.CFG桩复合地基的有限元分析.路基工程.2000(3).6-9
[13]娄国充,复合地基桩土应力比影响因素分析.路基工程.1998,5
[14]陈娟,吴西臣.桩网复合地基桩土应力比的确定.水文地质工程地质.2007,3
[15]冯瑞玲,谢永利,杨晓华.尹中高速公路粉喷桩复合地基桩土应力比现场试验研究.岩石力学与工程学报.2005,22
[16]王瑞永,李建光.滑移线场理论在CFG桩复合地基桩土应力比研究中的应用.岩土工程技术.2003,6
[17]孙健等.复合地基CFG桩负摩阻力的影响及研究.地质装备,2005,3
[18]张忠坤.复合地基临界桩长的研究.岩土工程学报,1999(21):2
[19]潘星.CFG桩复合地基沉降计算探讨.岩土力学,2005,05
[20]陈东佐,梁仁旺.CFG桩复合地基的试验研究,建筑结构学报,2002(23):4
[21]林晖.CFG桩复合地基桩土分担荷载比研究.土工基础,2004(18):4
[22]张晶,李斌.CFG桩复合地基承载力的试验研究.合肥工业大学学报(自然科学版).1999,05
[23]冯震,王连俊,许兆义.CFG桩竖向荷载作用下水平位移和弯矩的试验研究.土木工程学报,2005(38):2
[24]邢仲星,陈晓平.复合地基力学特性研究及有限元分析.土工基础,2000(14):2
[25]夏力农,王星华,蒋春平.桩顶荷载对桩基负摩阻力特性的影响.防灾减灾工程学报.2005,4
[26]李国维,杨涛.柔性基础下复合地基桩土应力比现场试验研究.岩土力学.2005,2
[27]万林海,郭平业,金海元.CFG桩复合地基沉降影响因素分析.工程地质学报.2006,14(04)
[28]刘吉福.路堤下复合地基桩土应力比分析岩石力学与工程学报.2003,4
[29]池跃君,宋二祥,陈肇元.刚性桩复合地基在不同荷载下的桩土分担特性.天津大学学报.2003,5
[30]何结兵,洪宝宁.CFG桩复合地基桩土应力比数值分析.扬州大学学报(自然科学版).2004.7(1).61-64
[31]化建新,董长和,孙东晖.CFG桩垫层效应研究岩土工程技术.1998(1).48-50
[32]吴建奇,张帆,王军.水泥粉煤灰碎石桩的室内模拟试验研究.江南大学学报(自然科学 版).2003.2(6).624-630
[33]张建伟,戴自航.CFG桩复合地基褥垫层效用的有限元分析.岩土力学.2005.26(增刊).171-174
[34]蒋玉川,张建海,李章政.弹性力学与有限元法.北京.科学出版社.2006.159-160
[35]梁清香.张根全编著.有限元与MARc实现.北京.机械工业出版社.2003.
[36]陈火红,祁鹏.MSC.Patran伽认RC培心11教程和实例.J匕京.科学出版社.2004
[37]陈火红,于军泉,席源山.MARC2003基础与应用实例[M].北京,科学出版社.2004
[38]陈火红.marc有限元实例分析教程.北京:机械工业出版社,2002.
[39]Palo Alto.MSC Analysis Research Corporation,MSC.M arc Theory and User Information[M]U S A:2000.
[40]戴民,周云东,张霆.桩土相互作用研究综述.河海大学学报:2006,34
[41]董必昌.岩土工程仿真中接触单元和相关参数研究.华中科技大学博士论文.2005.
[42]齐良锋,筒浩,唐丽云.引入接触单元模拟桩土共同作用.岩土力学.2005,1
[43]冯瑞玲,谢永利,方磊.柔性基础下复合地基的数值分,中国公路学报,2003,16(1):40-42
[44]何思明,郭强,卢国胜.单桩沉降计算理论研究.岩石力学与工程学报.2004,23(4)
[45]梁清香.张根全编著.有限元与MARc实现.北京.机械工业出版社.2003.
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